Nah berikut ini adalah Full MIUI ROM 5.6.4 Changelog

[System]
Optimization – Reduced battery consumption when WiFi is not connected (06-04)
Fix – System reboot caused by some third party apps (06-04)
Fix – WiFi could not be connected automatically when screen was turned off (06-04)
Fix -Phone got heat/high power consumption issues in some situations (06-04)
Fix – When connected to some portable WiFi devices, turning off the screen caused it to disconnect (06-04)